There are times when running outside may not be possible for you. Rainy days, cold weather, and extremely high temperatures can stop you dead in your tracks. On those days, a treadmill is the best alternative. With that said, treadmills do have their advantages and disadvantages. Some of the advantages are; first and foremost, you're out of the elements, your speed can be controlled and you can practice interval training. Furthermore, the machine can be elevated to simulate running uphill, The latter should be done if you want to become an efficient runner. Some of the disadvantages of using a treadmill are; you're in a temperature controlled enviornment, the scenery is always the same and there is the lack of wind resistance. Moreover, treadmills can be dangerous so use with caution. Lastly, a treadmill can be a good investment if purchased at the right price.There are machines out there that claim to do everything including, baby sitting and walking your dog. Remember to keep it simple. If you can't afford a new one, try the stores that sell used sports equipment. No need to take out a loan or borrow from your 401k. Personally, I do all my running outside. I have clothing for rainy days, cold weather and for high temperatures. More on that later.
Remember To Keep It Moving!